diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3006e61b8183f..68b779347ddb2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -101,9 +101,6 @@ jobs:
       - name: install MSYS2
         run: src/ci/scripts/install-msys2.sh
         if: success() && !env.SKIP_JOB
-      - name: install MSYS2 packages
-        run: src/ci/scripts/install-msys2-packages.sh
-        if: success() && !env.SKIP_JOB
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh
         if: success() && !env.SKIP_JOB
@@ -210,9 +207,6 @@ jobs:
       - name: install MSYS2
         run: src/ci/scripts/install-msys2.sh
         if: success() && !env.SKIP_JOB
-      - name: install MSYS2 packages
-        run: src/ci/scripts/install-msys2-packages.sh
-        if: success() && !env.SKIP_JOB
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh
         if: success() && !env.SKIP_JOB
@@ -561,9 +555,6 @@ jobs:
       - name: install MSYS2
         run: src/ci/scripts/install-msys2.sh
         if: success() && !env.SKIP_JOB
-      - name: install MSYS2 packages
-        run: src/ci/scripts/install-msys2-packages.sh
-        if: success() && !env.SKIP_JOB
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh
         if: success() && !env.SKIP_JOB
diff --git a/src/ci/azure-pipelines/steps/run.yml b/src/ci/azure-pipelines/steps/run.yml
index 85ff3e52a841d..e43116c06b6b7 100644
--- a/src/ci/azure-pipelines/steps/run.yml
+++ b/src/ci/azure-pipelines/steps/run.yml
@@ -82,10 +82,6 @@ steps:
   displayName: Install msys2
   condition: and(succeeded(), not(variables.SKIP_JOB))
 
-- bash: src/ci/scripts/install-msys2-packages.sh
-  displayName: Install msys2 packages
-  condition: and(succeeded(), not(variables.SKIP_JOB))
-
 - bash: src/ci/scripts/install-mingw.sh
   displayName: Install MinGW
   condition: and(succeeded(), not(variables.SKIP_JOB))
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index 1cf828fd64e20..3404d02425595 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -146,10 +146,6 @@ x--expand-yaml-anchors--remove:
         run: src/ci/scripts/install-msys2.sh
         <<: *step
 
-      - name: install MSYS2 packages
-        run: src/ci/scripts/install-msys2-packages.sh
-        <<: *step
-
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh
         <<: *step
diff --git a/src/ci/scripts/install-msys2-packages.sh b/src/ci/scripts/install-msys2-packages.sh
deleted file mode 100755
index ff7479c05d04e..0000000000000
--- a/src/ci/scripts/install-msys2-packages.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/bin/bash
-
-set -euo pipefail
-IFS=$'\n\t'
-
-source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
-
-if isWindows; then
-    pacman -S --noconfirm --needed base-devel ca-certificates make diffutils tar \
-        binutils
-
-    # Detect the native Python version installed on the agent. On GitHub
-    # Actions, the C:\hostedtoolcache\windows\Python directory contains a
-    # subdirectory for each installed Python version.
-    #
-    # The -V flag of the sort command sorts the input by version number.
-    native_python_version="$(ls /c/hostedtoolcache/windows/Python | sort -Vr | head -n 1)"
-
-    # Make sure we use the native python interpreter instead of some msys equivalent
-    # one way or another. The msys interpreters seem to have weird path conversions
-    # baked in which break LLVM's build system one way or another, so let's use the
-    # native version which keeps everything as native as possible.
-    python_home="/c/hostedtoolcache/windows/Python/${native_python_version}/x64"
-    cp "${python_home}/python.exe" "${python_home}/python3.exe"
-    ciCommandAddPath "C:\\hostedtoolcache\\windows\\Python\\${native_python_version}\\x64"
-    ciCommandAddPath "C:\\hostedtoolcache\\windows\\Python\\${native_python_version}\\x64\\Scripts"
-fi
diff --git a/src/ci/scripts/install-msys2.sh b/src/ci/scripts/install-msys2.sh
index 0ecc14b946842..185d361582505 100755
--- a/src/ci/scripts/install-msys2.sh
+++ b/src/ci/scripts/install-msys2.sh
@@ -1,10 +1,6 @@
 #!/bin/bash
 # Download and install MSYS2, needed primarily for the test suite (run-make) but
 # also used by the MinGW toolchain for assembling things.
-#
-# FIXME: we should probe the default azure image and see if we can use the MSYS2
-# toolchain there. (if there's even one there). For now though this gets the job
-# done.
 
 set -euo pipefail
 IFS=$'\n\t'
@@ -12,16 +8,9 @@ IFS=$'\n\t'
 source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
 
 if isWindows; then
-    # Pre-followed the api/v2 URL to the CDN since the API can be a bit flakey
-    curl -sSL https://packages.chocolatey.org/msys2.20190524.0.0.20191030.nupkg > \
-        msys2.nupkg
-    curl -sSL https://packages.chocolatey.org/chocolatey-core.extension.1.3.5.1.nupkg > \
-        chocolatey-core.extension.nupkg
-    choco install -s . msys2 \
-        --params="/InstallDir:$(ciCheckoutPath)/msys2 /NoPath" -y --no-progress
-    rm msys2.nupkg chocolatey-core.extension.nupkg
-    mkdir -p "$(ciCheckoutPath)/msys2/home/${USERNAME}"
-    ciCommandAddPath "$(ciCheckoutPath)/msys2/usr/bin"
+    msys2Path="c:/msys64"
+    mkdir -p "${msys2Path}/home/${USERNAME}"
+    ciCommandAddPath "${msys2Path}/usr/bin"
 
     # Detect the native Python version installed on the agent. On GitHub
     # Actions, the C:\hostedtoolcache\windows\Python directory contains a